Shelford, Victor E. <br/><br/>
The ecology of North America 

 - Urbana :  University of Illinois,  1963 
 - 610 p.  : ilus. 
<br/><br/><label>LCCN: </label>56041 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecología.
<br/><br/><label>Dewey Class. No.: </label>574.5  / S44